Valve Corporation announces a new Steamworks feature called Steam Guard, which sounds like a deodorant or an account security feature. It turns out to be the latter, as they say this "allows users to link management of their account to a specific PC. Attempts to modify or change account settings by any other PC won't be possible without the user's approval." They say Steam Guard, which will be available to third-party developers, will also support Intel's upcoming Identity Protection Technology, a hardware encryption scheme for 2nd Generation Intel Core CPUS that replaces the need for an external key generator. "Account phishing and hijacking are our #1 support issues," said Gabe Newell, President of Valve. "With Intel's IPT and Steam Guard, we've taken a big step towards giving customers the account security they need as they purchase more and more digital goods." As an aside, this is the first time we've seen Gabe referred to as Valve's President, as his title has always been Managing Director. We've inquired about this fairly unimportant distinction, but have yet to receive a reply.

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They say Steam Guard, which will be available to third-party developers, will also support Intel's upcoming Identity Protection Technology, a hardware encryption scheme for 2nd Generation Intel Core CPUS that replaces the need for an external key generator.

This part, however, does read like it would/could tie your game to one PC and one PC only.